Quarterly report pursuant to Section 13 or 15(d)

Joint Venture Agreement - Additional Information (Detail)

v3.5.0.2
Joint Venture Agreement - Additional Information (Detail) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Oct. 31, 2013
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2017
Dec. 31, 2015
May 31, 2013
Schedule of Equity Method Investments [Line Items]                    
Common stock, shares issued (in shares) 10,000 18,870,000       18,870,000     13,652,000  
Additional expense related to shares issued $ 175       $ 231          
Joint venture net loss           $ 45 $ 748      
Joint Venture Agreement                    
Schedule of Equity Method Investments [Line Items]                    
Percentage of outstanding membership interests in joint venture                   50.00%
Investment in joint venture $ 1,000     $ 1,000            
Fair value of capital contribution in joint venture   $ 6,000       6,000        
Joint Venture Agreement | Maximum                    
Schedule of Equity Method Investments [Line Items]                    
Investment in joint venture           4,000        
Joint Venture Agreement | Scenario, Forecast                    
Schedule of Equity Method Investments [Line Items]                    
Investment in joint venture               $ 1,000    
Research and Development                    
Schedule of Equity Method Investments [Line Items]                    
Joint venture net loss   18 $ 343     45 $ 748      
Equity Method Investee                    
Schedule of Equity Method Investments [Line Items]                    
Due from related parties, current   $ 10       $ 10